<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>pwa</title>
</head>

<body>

  <h1 id="h">打包的时候不要打jquery，它通过外部cdn加载</h1>
  <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
</body>

</html>